I'm seriously considering SLI'ing my 216's. The thing is, I don't know if i need to invest in a new PSU.

I realize that the HX620W only comes with 2x6+2PCI-E connectors, but i figured i could throw in a molex modular cable and use quick-connects.
Is it safe to run a second GTX 260 using quick-connects? and will the two cards + my rig utilize more than ~650 watts?

A lil' bit more than half with everything stock. You can take this as a baseline. Put another 100W for second GTX 260 and if you're not "playing" much Furmark and prime95 you'll be around 370W DC in games.

I'm thinking you'll be fine.... all the evidence I can find points that way.... from various forums:

Quote:

my GTX 260 is powered by a Corsair HX520

About maximal power draw...

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GTX 260 has a TDP of 182W which is ~15 amps total on 12V (5V current draw should be minimal). Those 15A will be split between the PCIe slot and the 2 connectors, and each source should draw no more than ~6A (75W), so you should be fine as long as you spread the load across your rails.

If you contact corsair they will send you new Cables that have 2 PCI-E power connectors each.
I did this a couple weeks ago for my HX620. Cables took about 2 weeks to arrive, but they gave me a whole bag of cables for free. They even paid for shipping.

So? in conclusion should i upgrade my PSU or will it run well? I mean i don't play any power hugging games like Crysis or Fear 2 or anything like that, so I don't expect full load to come soon.
BTW, What do you mean by 2 PCi connectors each? Like one line into the power supply has 2 PCI connectors coming out of it?

So? in conclusion should i upgrade my PSU or will it run well? I mean i don't play any power hugging games like Crysis or Fear 2 or anything like that, so I don't expect full load to come soon.
BTW, What do you mean by 2 PCi connectors each? Like one line into the power supply has 2 PCI connectors coming out of it?

Each modular plug into the power supply has the wires doubled up so it will support 2 pci 6pin connectors per modular cable instead of 1. Cosair did it right and ran new conductors for the second connector back to the PSU, so there are more wires in each cable. I hope this makes sense.